A heterodontosaurid ornithischian dinosaur from the Upper Triassic of Patagonia

Fragmentary remains of a new heterodontosaurid species, comparable to Heterodontosaurus Crompton and Charig, were discovered in concretions in the Laguna Colorada Formation, a Late Triassic continental sequence in Santa Cruz Province, Argentina. The material consists of a weathered, left posterior m...

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Detalles Bibliográficos
Publicado:	2001
Materias:	Dinosauria Heterodontosaurudae Ornithischia Patagonia Triassic dinosaur new species Argentina Heterodontosaurus
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00027014_v38_n3_p271_Bez http://hdl.handle.net/20.500.12110/paper_00027014_v38_n3_p271_Bez
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00027014_v38_n3_p271_Bez
record_format	dspace
spelling	paper:paper_00027014_v38_n3_p271_Bez2023-06-08T14:22:05Z A heterodontosaurid ornithischian dinosaur from the Upper Triassic of Patagonia Dinosauria Heterodontosaurudae Ornithischia Patagonia Triassic dinosaur new species Triassic Argentina Heterodontosaurus Fragmentary remains of a new heterodontosaurid species, comparable to Heterodontosaurus Crompton and Charig, were discovered in concretions in the Laguna Colorada Formation, a Late Triassic continental sequence in Santa Cruz Province, Argentina. The material consists of a weathered, left posterior maxillary fragment with dentition, and, tentatively, an isolated caniniform with anterior and posterior serrations. The preserved three maxillary teeth bear flat wear facets, and are columnar and closely packed. The anterior and posterior surfaces of the crowns are in contact, a feature considered a synapomorphy of Heterodontosaurus and Lycorhinus from the Early Jurassic upper Stormberg Group of southern Africa. As in Heterodontosaurus tucki Crompton and Charig, the maxillary teeth lack a cingulum or a constriction separating crown and root, and the wear facets of adjoining teeth form a single, continuous surface. However, the posterior maxillary teeth bear more numerous and narrower ridges on their labial surfaces than those of H. tucki. This new record of a heterodontosaurid extends the temporal range of this group of small ornithischians and, considering the phylogeny of ornithischians as now understood, indicates an extensive phyletic diversification of these dinosaurs in the Late Triassic. 2001 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00027014_v38_n3_p271_Bez http://hdl.handle.net/20.500.12110/paper_00027014_v38_n3_p271_Bez
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Dinosauria Heterodontosaurudae Ornithischia Patagonia Triassic dinosaur new species Triassic Argentina Heterodontosaurus
spellingShingle	Dinosauria Heterodontosaurudae Ornithischia Patagonia Triassic dinosaur new species Triassic Argentina Heterodontosaurus A heterodontosaurid ornithischian dinosaur from the Upper Triassic of Patagonia
topic_facet	Dinosauria Heterodontosaurudae Ornithischia Patagonia Triassic dinosaur new species Triassic Argentina Heterodontosaurus
description	Fragmentary remains of a new heterodontosaurid species, comparable to Heterodontosaurus Crompton and Charig, were discovered in concretions in the Laguna Colorada Formation, a Late Triassic continental sequence in Santa Cruz Province, Argentina. The material consists of a weathered, left posterior maxillary fragment with dentition, and, tentatively, an isolated caniniform with anterior and posterior serrations. The preserved three maxillary teeth bear flat wear facets, and are columnar and closely packed. The anterior and posterior surfaces of the crowns are in contact, a feature considered a synapomorphy of Heterodontosaurus and Lycorhinus from the Early Jurassic upper Stormberg Group of southern Africa. As in Heterodontosaurus tucki Crompton and Charig, the maxillary teeth lack a cingulum or a constriction separating crown and root, and the wear facets of adjoining teeth form a single, continuous surface. However, the posterior maxillary teeth bear more numerous and narrower ridges on their labial surfaces than those of H. tucki. This new record of a heterodontosaurid extends the temporal range of this group of small ornithischians and, considering the phylogeny of ornithischians as now understood, indicates an extensive phyletic diversification of these dinosaurs in the Late Triassic.
title	A heterodontosaurid ornithischian dinosaur from the Upper Triassic of Patagonia
title_short	A heterodontosaurid ornithischian dinosaur from the Upper Triassic of Patagonia
title_full	A heterodontosaurid ornithischian dinosaur from the Upper Triassic of Patagonia
title_fullStr	A heterodontosaurid ornithischian dinosaur from the Upper Triassic of Patagonia
title_full_unstemmed	A heterodontosaurid ornithischian dinosaur from the Upper Triassic of Patagonia
title_sort	heterodontosaurid ornithischian dinosaur from the upper triassic of patagonia
publishDate	2001
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00027014_v38_n3_p271_Bez http://hdl.handle.net/20.500.12110/paper_00027014_v38_n3_p271_Bez
_version_	1768545625762168832

A heterodontosaurid ornithischian dinosaur from the Upper Triassic of Patagonia

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